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Resuspension of ash after the 2014 phreatic eruption at Ontake volcano, Japan
Journal of Volcanology and Geothermal Research, 2018Abstract We determined the resuspension process of an ash deposit after the phreatic eruption of September 27th, 2014 at Ontake volcano, Japan, by analyzing the time series data of particle concentrations obtained using an optical particle counter and the characteristics of an ash sample.
Takahiro Miwa +2 more
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Shallow dolerite intrusion and phreatic eruption in the Allan Hills region, Antarctica
New Zealand Journal of Geology and Geophysics, 1974Abstract Shallow intrusion of dolerite sills into porous and permeable Permian-Triassic strata in the Allan Hills region resulted in steam pressures which exceeded that of the roof rocks causing fracturing and fluidisation of the sediments and the formation of volcanic mudflows and explosion breccias.
R. H. Grapes +2 more
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Experimental modelling of fragmentation processes within phreatic and hydrothermal eruptions
2012Phreatic and hydrothermal eruptions often occur with little or no warning representing a significant hazard within geothermal regions. These violent eruptions occur at a range of temperatures and pressures within varying rock types. A range of mechanisms including heating or decompression, allows hydrothermal/supercritical fluid to rapidly flash to ...
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Pyroclastic density current from the 1888 phreatic eruption of Bandai volcano, NE Japan
Journal of Volcanology and Geothermal Research, 1999Abstract The great eruption of July 15, 1888 at Bandai volcano produced large phreatic explosions and a major debris avalanche toward the northern foot. This eruption is characterized as follows: (1) there was no significant precursor; (2) the eruption and collapse of the volcanic edifice were triggered by an earthquake with a magnitude of about 5 ...
Takahiro Yamamoto +2 more
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Three-dimensional, multiphase flow numerical models of phreatic volcanic eruptions.
Explosive volcanic eruptions are characterized by the ejection in the atmosphere of volcanic gases and fragments of magma and/or lithics at high temperature, pressure and velocity. They encompass a broad range of magnitudes, with volumes of ejecta spanning from less than 106 m3, to 109-1011 m3 of Plinian eruptions, up to the largest known volcanic ...Tomaso Esposti Ongaro +1 more
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Phreatic eruptions and the influence of hydrothermal alteration on their processes
2016Phreatic eruptions are possibly the most drastic surface expressions of hydrothermal activity within active epithermal systems (geothermal fields), and they are still poorly understood. Various phenomena, such as fumaroles, hot springs, mud pools, and soil encrustations represent further obvious features of the interaction between outgassing ...
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Probable dynamic triggering of phreatic eruption in the Tatun volcano group of Taiwan
Journal of Asian Earth Sciences, 2017Abstract On 16 March 2014 (UTC), a small phreatic eruption occurred in the Tatun volcano group (TVG) of Taiwan, although it was not reported until analysis of both seismic and acoustic data revealed that the source was in the vicinity of the Hsiaoyukeng fumarole.
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